How can I simplify an assembly?

I have a very large assembly that is killing my computer. I would like to make a simple part file out of this that is usable. In Inventor I used a command called shrinkwrap to turn an assembly into a part file. It also removed internal features and patched holes reducing the file size. I know in solidworks I can save an assy as a part file but is there a tool that works similar to what Inventor has?